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N.9 <br /> . . SEOTION 1 <br /> E <br /> PRELIMINARY EVALUATION TION OF TANK <br /> �i <br /> SITES <br /> Fx <br /> f <br /> This workplan has been prepared for the closure of two underground <br /> storage tanks located in Stockton, California (San Joaquin County). <br /> The tanks are owned by Catellus Development Corporation. The tank <br /> sites he adjacent to active warehousing facilities at 1325 & 1541 West <br /> Weber Avenue (Figure 1-1). The respective facilities are currently <br /> lc�o occupied by Graphic Contractors and General Potato and Onion. The <br /> storage tanks are not in use. <br /> Tank Histories <br /> Documentation of the installation and use of the tanks could not be <br /> located. Neither San Joaquin County nor the property owner nor the <br /> �r. ..� lessees have any records regarding the installation date and tank <br /> f use. Therefore, size and construction details are unknown. <br /> According to the manager of General Potato and Onion, the tanks <br /> c were probably installed when the warehouses were constructed in <br /> sr 1 the mid-1960s. <br /> ¢ Preliminary Tank Survey <br /> Because information was not available regarding the exact location <br /> and size of the underground storage tanks, the tanks were surveyed <br /> on June 19, 1991 by Spectrum Environmental Services. Spectrum <br /> utilized a combination of direct measurement of the tanks and <br /> F indirect geophysical techniques. Spectrum was able to determine <br /> tank capacity, orientation in the ground, depth, and approximate <br /> j amount of remaining product. <br /> The survey indicated that the storage tank at 1325 West Weber <br /> r;€ Avenue lies adjacent to the building as depicted in Figure 1-2. The <br /> tank was found to have a capacity of approximately 500 gaLons and <br /> has approximately 300 gallons of unknown product remaining in it. <br /> E e The top of the tank is approximately 3-112 feet below the ground <br /> surface and the bottom is at approximately 7-112 feet. <br /> w <br />